Stapler



H. KEIL STAPLER Marel 28, 1944.

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5 Sheets-Sheet 2 Filed May 4, 1942 H. KElL STAPLER Filed May 4. 1942 5Sheets-Sheet .'5

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H. KEIL STAPLER March 28, 1944,

Filed May 4, 1942 H. KEIL March 28, 1944.

STAPLER 5 Sheets-Sheet 5 Filed May 4, 1942 Patented Mar. 28, 1944STAPLEB Henry Keil, Chicago, IIL, assignor to Signode Steel strappingCompany. Chicago, Ill., a corporation of Delaware Application May 4,1942, Serial No. 441,656

dClalms.

My invention relates generally to staplers, and it will be described asembodied in an automatic hand operated staple hammer.

An object of my invention is the provision of a stapler which is ofsolid and substantial construction and which is economical tomanufacture.

. Another object of my invention is to provide an improved stapler,wherein an inertia member is mounted to carry through the stapiingstroke independently of the rest of the stapler. A further object is toprovide a stapler having relatively great staple driving power inproportion to its size, and which is suiiiciently compact to be used inrestricted spaces.

A further object of my invention is to provide a stapler with animproved staple magazine closure.

Another object oi my invention is to provide a stapler which may berefilled easily and which will not eject staples during the refillingoperation.

A further object is to provide a stapler in which a single part servesboth as a staple magazine closure and as an impact member which comesinto contact with the object to be stapled.

Another object is to provide a stapler which is capable -or driving astaple into an object when held at an angle thereto.

Another object of my invention is to provide a stapler in which themagazine is completely accessible and which is readily and completely demountable for ordinary repairs without the need of tools.

A further object is to provide a stapler with a minimum number ofmovable wearing parts.

Other objects and advantages will hereinafter appeal 4 In the drawings:

Fig. 1 is a top plan view of a stapling hammer embodying my invention:

Fig. 2 is a side elevational view thereof;

Fig. 3 is an irregular transverse sectional view taken on the line 3--3of Fig. 2, the outer hand grip being omitted for the sake of clarity;

Fig. 4 is a side view of the head or striking portion oi' the stapler,partially broken away, and shown in normal or inoperative position:

Fig. 5 is a side view similar to Fig. 4, showing the stapler in anoperative position near the completion of a staple inserting stroke.

Fig. 6 is a vertical sectional view of the entire stapler taken on thelines 6-8 of Fig. 1;

'l is a transverse sectional view taken on the line 'l-l of Fig. 6;

Fig. 8 is a vertical sectional view of the staple magazine and itsassociated parts;

Fig. 9 is a perspective view of the front maga'- zine guide and handlebracing member: n Fig. 10 is a perspective view of the latch car- Fig.11 is a front pier; I Fig. 12 is a sectional view taken on the lineI2-i2 of Fig. 2;

Fig. 13 is an irregular sectional view taken on the line I3I3 of F18. 62

Fig. 14 is a sectional view taken on the line Il-M of Fig. 6;

Fig. 15 is a detailed elevational view of the lf)ront magazine guide andhandle bracing mem- Fig. 16 is a sectional view taken on .the linelli-i6 ci' Fig. 15:

Fig. 17 is a sectional view taken on the line I'I-I'l of Fig. 15; and

Fig. 18 is a view, partially in section, of the stapler with the handlemember and its associated parts withdrawn to prepare the stapler forloading, but with the staple gate and driving member in normal position.

General description of the staplerA Referring to Fig. l, the stapler iscomposed generally o! a head portion 20, which constitutes generally thestaple driver. and a handle portion 22 which serves also as a staplemagazine. A staple-feed spring housing 24 is made integral with theouter tubular member 2| oi the handle portion 22.

view of the head of the sta- The head portion is made up of a number oimaior parts, namely, a striking member 26 adapted to come into forcefulcontact with the object to be stapled, and an inertia member 2l whichreceives its impetus fromthe striking member 2| and which during onestage of operation travels in a direction opposite thereto. The inertiamember 2B is secured to an attenuated staple driver 3l which drives thestaples, one by one, into the object to be stapled, i. e., thev work(see Fig. 5). Transfer of momentum between the striking member 26 andinertia member 2l is attained by means of a rack and pinion arrangementto be explained. Riveted to the spring housing 24, and extending forwardtherefrom, are a pair or stops 3l which limit the movement of both thestriking member 26 and the inertia member 28.

'I'he handle portion 22 carries the spring housing 24 in which is a coilspring 32 ior urging forward the staples 3| within the magazine. A

latch 38 may be depressed by the operator to permit the handle to bedrawn away from the head portion during a refilling operation or in caserepairs are necessary. A hand grip 48 of rubber or similar material isprovided to facilitate handling of the stapler.

The staple driving mechanism The staple driving mechanism may beconsidered to be in the head portion of the stapler while the staplefeeding mechanism, consisting of the magazine and its associated parts,may be considered to be in the handle. The striking member 28, when inan inoperative position, extends below the body of the stapler. As seenin Figs. 1 and 2, the rear portion of the striking member 28 hasinwardly directed flanges 58 which extend throughout its length andwhich hold the striking member 28 slidably on a drive guide 52. Whilethe outer edges of the drive guide serve as a-slide for the strikingmember, the drive guide has in addition an elongated rectangular slot 54(see Fig. 16), extending throughout the greater part of the lengththereof to serve as a slideway for the inertia member 28. Inertia member28 and staple driver 38 are secured together and both are slidablymounted relative to guide member 52. Thus staple driver 38 has a key 58formed integrally therewith, this key extends through the elongated slot54 in guide member 52, and inertia member 28 is fastened to key 58 bypins 88. The forward portion of the inertia member 28 provides twoadditional bearing surfaces 82 which bear against the rear of the driveguidey and which,`in conjunction with the staple driver 38 and the key58, serves to hold both the inertia member 28 and the staple driver 38in tight but slidable relation with the drive guide 52 Qsee Fig. 13).

The forward face oi' the drive guide 52 is provided with a groove 83 toform part of a slide-way for the staple driver 38. The rearward face ofthe striking member 28 is similarly grooved to complete the slide-wayfor the staple driver. This slide-way 84, formed by the complementarygrooves of the two members 28 and 52 serves as a passageway for thestaple as it is impelled by the staple driver 38.

'Io facilitate the removal of the pins 88 and the disconnecting of thestaple driver 88 from the inertia member 28 in case repairs arenecessary, the inertia member 28 is provided with holes 88 located inthe side thereof and in axial alignment with the pins 88. These holes 88have a bore sufflcient to allow passage of the pins 88 therethrough. Onthe opposite side of the inertia member 28 are additional holes 88 ofslightly smaller diameter than the holes 88, butin axial alignmenttherewith. The purpose of the smaller holes 88 is to permit theinsertion of a punch or similar tool to engage the pins 88 and forcethem out of the inertia member 28 through the holes 88 (see Fig. 13).

In order toassure rigidity of the assembled parts of the head, and inorder to provide for secure attachment of the head of the stapler to thehandle, the drive guide 52 and the base 12 of the stapler aremadeintegral. (See Figs. 15 and 16.) This base is of relatively heavymetal, and is in the form of a hollow square in cross section, providinga space through which extends the front staple guide 14. (See Fig. 9.)The front staple guide has dual functions. First, it serves as theforward end of the staple magazine to support and guide the staples toposition t5 below the driver I8: secondly, it provides a rigid handlebracing member. As a handle bracing member, the front staple guide 14bears a great part of the shock of each blow of the stapler. The methodof attaching the head to the handle by means of the staple guide will bedescribed in greater detail subsequently.

Extending upward from the base 12, and made integral therewith, is apinion support 18 carrying a stub shaft 'I8 near its upper end. Thispinion support is located slightly to the rear of the drive guide 52 andapproximately in the same plane as the edge of the drive guide. The stubshaft 18 extends outward beyond the plane of both the pinion. supportand the drive guide (see Figs. 15 and 16).

The inertia member is urged to its inoperative or upper position bymeans oi a spring 88, one end of which extends into a bore 82 in theinertia member, and the other end of which exte'nds into a shallowcavity 84 in the upper surface of the base l2 of the stapler (see Fig.6). The upper limit of the movement of the inertia member 28 isdetermined by contact of the key 58 with the upper end of the slot 54 inthe drive guide 52.

The rack and pinion assembly in the head of the stapler is shown mostclearly in Figs. 1, 4, and 5. The striking member 28 carries arack 88adjacent its upper end. This rack engages a pinion 88 carried by thestub shaft 18. A second rack 98, slidably mounted in an elongatedchannel 82 in the inertia member 28, completes the rack and pinionassembly. This slidable rack provides a novel and effective means ofdelivering the full force of the blow to the staple.

The channel 82 is appreciably longer than the rack 88 in order to permita longitudinal sliding movement of the rack within the channel. The rackis provided throughout the greater part of its length with an enlargedbore 84 terminating at an annular shoulder 88 in a smaller bore 88. Apin |88, the ends of which are carried by the end walls of the channel82, extends through the bores to maintain the rack in position Withinthe channel. The smaller bore 88 serves as a bearing for one end oi therack, while a bushing I 82, slidably mounted in the open end of theenlarged bore 84, serves as a bearing for the other end. A coil spring|84 positioned in the bore 84 surrounds the pin |88. One end of thespring |84 abuts the bushing |82, urging the bushing against the upperend of the channel 82. The other end of the spring abuts the annularshoulder 88, thus urging the rack 88 against the lower end |88 of thechannel 82 when the inertia member is in its inoperative position (Fig.4) Observing the head portion of the stapler in Figs. 4 and 5, it may beseen that when the striking member 28 is struck sharply against theobject |88 to be stapled, the striking member remains stationary againstthe object, while the force of the blow carries the remainder of thehead portion, as well as the handle, in the direction of the object tobe stapled, the entire assembly sliding on the drive guide 52 which isintegral with the base 12 of the stapler.

In addition to the relative movement between the striking member 28 andthe rest ofthe stapler, the inertia member 28 and the staple driver 38,to which the inertia mem-ber is attached, move independently in thedirection of the object to be stapled. 'I'his movement is imparted tothe inertia member through the rack and pinion arrangement in thefollowing manner: Upon striking the object |88, the striking memberremains in contact with the object, while the rest oi' the stapler,impelled by the force of the blow, follows through the stroke in thedirection of the object |08, as described. 'I'he relative movementbetween the striking member, which of course becomes stationary when itstrikes the work, and the moving head of the stapler, to which thepinion 88 is attached. causes the pinion to rotate in a clockwisedirection, impelled by contact with the rack 88. As the pinion 88rotates, the rack 90 which is meshed therewith travels forcibly downwardin the direction of the object |08, carrying with it the inertia member28 and the staple driver 30 attached thereto. The spring 80 within thebore 82 of the inertia member is made sufficiently compressible to givereadily under the impact, and yet is of sumcient resilience to returnthe parts to an inoperative position at the conclusion of the staplingstroke.

When the bottom I| of the base 12 strikes against the object |08 to bestapled, the inertia member continues to drive by reason of its ownmomentum in the direction of the object |08. The striking member 26linked to the inertia member through the racks and pinion also continuesthe relative movement in an upward direction until brought to a suddenstop by the contact of the two lugs I I2 with the pair of stops 3|.Contact of the lugs ||2 with the stops 3| terminates .not only thetravel of the striking member 26, but also abruptly terminates themovement of the racks 86, 90 and the pinion 88 as well. Although theeiective movement of the racks and pinion has been terminated' theinertia member, being slidably associated with the rack 90, continues totravel forcefully in the direction of the object |08. The power whichhas been applied to the inertia member through the racks and pinion,coupled with the original downward 'movement of the inertia member inthe direction of the object, imparts an extraordinary driving force tothe inertia member near the completion of its stroke, thereby assuring awell driven staple IIS.

The inertia member 28 is brought to a stop by contact with the upperedges of the stops 3|. 'I'his position marks the completion of thestapling stroke (see Fig. 5). It is to be noted that the staple driver30 is made suiiiciently long to protrude slightly below the base 12 atthe conclusion of the stapling stroke. 'I'his not only makes it possibleto drive the staple slightly below the surface of the object |08, ifdesired, but 4 The staple feeding mechanism The handle portion 22 of thestapler, which carries the staple feeding mechanism, is composedprimarily of two telescoping tubular members, approximately square incross section. The inner tubular member is termed a staple retainer|26,I andis securely attached to the head of the 'stapler by means ofthe front staple guide 14, as will be described, and by welding, |28.(See Figs. 6, 8, and 9.) The front staple guide, which serves also as ahandle bracing mem-ber, hasv an enlarged frontal portion the sides |30of which are flanged to provide a forward runway |32 for the staples 34.The sides |30 of the front staple guide fit snugly within the stapleretainer |26, and the base of the frontal portion of the front stapleguide rests within the base 12 o f the stapler.

members, the latch, when extending through the slot |16, may bedepressed again and the outer Exam'm The forward end of the lower sideof the staple retainer |28 is cut short so that it abuts the bottom edge||0 of the base of the stapler (sec- Fig. 8). A weld |28 is made at thispoint. The remaining three sides of the staple retainer extend throughthe hollow base 12 of the staples, two of the sides |34, |36 formingpart of the slideway 64 in the forward face of the drive guide 52 (Fig.12') A hole |38 in the frontal portion of the front staple guide 14 isthreaded to receive a screw |40 which firmly connects the front stapleguide with'the base 12 of the stapler. The rearward portion of the frontstaple guide is provided with a number of vertical holes |42 by means ofwhich it is securely riveted tothe staple retainer |26 with rivets |44,|48. A hole |48 in the upper side of the staple retainer provides foraccess to the forward rivet |44 during the assembly of the stapler.

A staple support core |52 abuts the front staple guide 14 and isattached to the staple retainer 26 by means of a number of countersunkrivets |54. The core |52 is provided with spacers |56 at intervals inorder to make certain that it will be of uniform width throughout itslength so that the staples will not bind. The top of the staple retainer|26 comprises two inwardly disposed flanges |56 extending the lengththereof. These flanges are spaced apart from each other, and so providean open space running the length of the handle of the stapler throughwhich the staples on the magazine may be manipulated in case a iamshould occur. The flanges are spaced from the top of the staple supportcore |52 a distance sufficient only to permit the free passage ofstaples 34 along the magazine, thereby preventing the staples from`becoming displaced, even when subjected to severe jarring, and eventhough the stapler may be held in an inverted position (see Fig. 3). g

At the rear of the staple support core |52 is a latch carn'er |60fastened to the staple retainer |26 by meansef a rivet |6| (see Fig.10). The latch 36 is mounted on a shaft |62 vjournaled in holes |64 inthe latch carrier- Thelower Walls of both the outer tubular member 2|and staple retainer |26 are provided respectively with juxtaposedelongated slots |10, |12 through which the latchv 38 extends. The latchis urged outwardly through the slots by a latch spring |14, and theforward end of the latch engages .the forward edge of the slot |10 inthe outer tubular member 2| thereby locking together the outer tubular;

member and the staple retainer I 26 in the closed position shown inFigs. 2 and 6. In this telescoped relation the tubular membersconstitute a strong, rigid handle, well able to withstand the severeshocks to which stapler is subjected.

When the operator desires to load the stapler or to disassemble it, thelatch 36 is depressed, thereby permitting the outer tubular member 2| tobe moved rearwardly relative to the staple retainer |26 as shown in Fig.18. An additional slot |16 adjacent the forward end of the outer tubularmember 21 serves to catch the latch 38| and prevent the outer tubularmember from becoming entirely separated from the staple retainer. Incase it is desired to separate these tubular member removed entirely.

The latch carrier |60 performs the additional function of preventing thestaples from sliding beyond the rear of the staple support core |52.

This is accomplished by means ot a aange |18 A..1 a J on the latchcarrier (see Figs. 6 and 10). This flange is somewhat higher than thelower ends |88 of the staples in the magazine and so engages the lowerends of the rearmost staple thereby preventing further rearward movementof the staples.

The staples are urged forward by a staple pusher |84 traveling slidablybetween the anges |58 and the staple support core |52 in the samerelative position as the staples. The coil spring 32 which activates thestaple pusher iscarried by a spring tensioner |86 journaled in thespring housing 24 and locked in position by means of a cotter pin |88.The free end of the coil spring is bent over upon itself and is attachedto the staple pusher |84 by means of a rivet |88. Figure 6 shows thestapler with the magazine entirely loaded with staples, the staplepusher |84 being at the extreme rear of the staple magazine. As thestaples are used, the spring 32 and the staple pusher |84 urges thestaples forward, so that they may be used oneby one. As the last staplein the magazine is used, a detent |82 on the staple pusher encounters ashoulder |94 on the front staple guide 14, thereby preventing the staplepusher from protruding into the path of the staple driver 38 andbecoming damaged.

The rearward end of the outer tubular member 2| is closed by means of acap |94 held in place by a rivet which extends through the tubularmember.

The staple gate An important feature of my invention resides inthestaple gate or closure 288 which is made integral with the strikingmember 26 (see Figs. 1l and 12). It will be observed that the outer faceofthe staple gate 288 is recessed in order to diminish its weight, sothat the full inertia of the striking member may be transmitted to theinertia member 28 without undue loss of power. As has been described,the groove in the rearward face of the striking member, combined withthe groove 83 oi' the forward face of the drive guide 52 forms theslide-way 64 in which travels the staple and the staple driver 38. Theslide-way 64 is of a width sufllcient to accommodate only one staple ata time. Therefore, when the staples 34 within the magazine are urgedforward by the staple pusher |84, there is room in the slideway 64 foronly the foremost staple when it is brought to bear against the rearwardface of the staple gate 288. Upon the staple being driven, and after thereturn oi the parts to an inoperative position, the next staple will beurgedforward into the slide-way ready for the next staple drivingoperation.

Not only does my novel staple gate make certain that only one staple ata time is in a position to be driven, but in conjunction with the staplefeeding mechanism, the staple gate performs the further function ofpreventing staples from becoming ejected from the stapler during arefilling operation. It will be noted that when the inner and outertubular handle members are completely telescoped, 'the stops 3|l are intheir forward position as shown in Fig. 2. It is therefore not possibleto remove the staple gate 288 until the stops 3| are withdrawn from thepath of the lugs ||2. This may be done by depressing the latch 38 andmoving the outer tubular member 2| rearwardly, carrying the stops 3|with it. The outer tubular member is moved rearwardly until the latch 38engages the Vforward slot |18; this relative position of the will causethe staple gate to move upwardly on the drive guide 52 until the rack 88on the staple gate is no longer meshed with the pinion 88. The stamjalemay then be slid manually` frgmthe drive gui el" efiiertiember allowedto springt-lancements',ypnemrinoperauve pdsition"v 'A'I'lie'rwardopening of j llinagazine is thereby eiwamemsupblx 0f istaplesl'gillltedilthemagazinef Fig. 8 sho'w'the stapler head 28 withthe staple gate 288 removed and the forward end of the magazine openedto receive a new stick of staples.

Although a supply of staples may have been left in the magazine at thetime the staple gate 288 is removed, my stapler will not cause thestaples to be ejected, as is the case with many conventional staplingmachines. It will be noted that in order to remove the staple gate 288,it is rst necessary to withdraw the outer tubular member 2| to the rear.Inasmuch as the spring `housing 24, the spring 32, and the staple pusher|84, are all carried by the outer tubular member, these members likewisemove rearwardly. The staple pusher |84 is thereby withdrawn from contactwith the staples remaining in the magazine, and when the staple gate isremoved and the forward or open end of the magazine made accessible, thestaples within the magazine will remain in place.

Operation of the stapler 'Assuming that the stapler is empty, it is rstnecessary to fill the magazine with staples before the stapler can beused. Ordinarily, the staples are provided in magazine form, aconsiderable number of staples being held together by some form ofbinder in the nature of a light glue. The staples are inserted in themagazine, as previously described, after which the inertia member smanually depressedbthgtaple mupxdriye; guidejzandtbe racliapnh Hare...allowedl tof.' mesh... Upon. releasing thenertia member, the spring 88carriesv the parts to the inoperative position shown in Fig. 18. Thetubular handle members are then completely telescoped, so that thestaple pusher |84 urges the foremost staple against the staple gate 288and into -position in the slide-way B4 (Fig. 2 and Fig. 6). The foremoststaple is then ready to be driven. The stapler is firmly grasped in thehand of the operator and the striking member is struck against theobject to be stapled, the force of the blow being transmitted to theinertia member, as described. The staple driver 38 is thereby brought tobear suddenly and forcefully against the staple within the slide-way 64.The impact breaks the bond between the staples and carries the drivenstaple completely into the object to be stapled.

Upon removing the striking member from contact with the object which hasbeen stapled, the spring 88 returns the parts to their originalposition. The staple driver 38 returns to its inoperative position,shown in Fig. 12, thereby clearing the slideway 64, and permitting thenext staple to be pushed forward against the staple gate ready for thenext'stapling stroke.

While I have described my invention in connection with a preferredembodiment thereof, it will be apparent to those skilled in the art thatnumerous variations and modiilcations may be made from the'structuredisclosed without; de-

parting from the underlying principles of my in` vention. I thereforewish to include within the scope of the following claims allconstructions by which substantially the results of my invention may beobtained by substantially the same or equivalent means.

Having illustrated and explained typical embodiments of my invention,what I claim and desire to secure by United States Letters Patent is asfollows:

1. A magazine stapler of the type having a striking member for initiallyengaging the work, a hammer member movable relatively to the strikingmember for driving a staple into the work, a magazine for holding aplurality of staples, and a staple feed for-advancing staples from themagazine into the path of travel of the hammer member; characterized byan inertia member rigidly secured to the hammer member, a rack andpinion connection between the striking member and the inertia membercausing the inertia member and the hammer' member carried thereby tocontinue movement after movement of the striking member has been stoppedby engagement with the work, and means permitting relative movementbetween the inertia member and the rack and pinion connection after therack and pinion connection ceases to function.

2. A magazine stapler ot the type having a striking member for initiallyengaging the work, a hammer member movable relatively to the strikingmember for driving a staple into the work, a magazine for holding aplurality of staples, and a staple feed for advancing staples from themagazine into the path of travel of the hammer member; characterized byan inertia member rigidly secured to the hammer member, a rack andpinion connection between the striking member and the inertia membercausing the inertia member and the hammer member carried thereby tocontinue movement after movement of the striking member has been stoppedby engagement with the work, a stop for arresting the functioning of therack and pinion connection, and means permitting relative movementbetween the inertia member and the rack and pinion connection after vtherack and pinion connection ceases to function.

3. A stapler having a striking member for impact against the object tobe stapled, an inertia member actuated by the relative motion of thestapler to the striking member, a staple driver operated by the inertiamember, and means for feeding staples one by one to the staple driver,said stapler being characterized by means terminatng the relativeeffective movement between the stapler and the striking member at thetermination of the power travel of the stapler, and means carried bysaid inertia member to permit it to travel toward the work independentlyof the travel of the stapler and the striking member.

4. A stapler of the type having a movable striking member for impactagainst the object to be stapled, a rack 'integral with the strikingmember, an inertia member, a second rack slidably mounted in saidinertia member, means preventing relative motion between said secondrack and said inertia member, a pinion meshed with said racks, a stapledriver carried by said inertia member, means for feeding staples one byone to said staple driver, said stapler being characterized by means forstopping the effective relative movement between the stapler and thestriking member before the stapling stroke is completed, and saidrelative motion preventing means, said last mentioned means beingrendered inoperative when the travel oi?A the stapler is stopped at thework to permit the inertia member to complete the stapling stroke.

HENRY KEIL.

CERTIFICATE OF COHRECTI ON.

Patent No'. 2,5ll5,267.

miren 28, 19141;.

HENRY KEIL.

It is hereby certified that error appears in the printed specificationof the above numbered patent requiring oorrecti. on as follows: Page 5,seccorrection therein that the same mw conform to the record of the inthe Patent Office.

'l line 6, for staples read stapler; line 58, before "stapler and thatthe said Letters Patent should be read with this Signed and sealed this61h day oi June, A. D. 19h14..

(Seal) Leslie Frazer )Acting Commissioner of Patents.

be made from the'structure disclosed without; de-

parting from the underlying principles of my in` vention. I thereforewish to include within the scope of the following claims allconstructions by which substantially the results of my invention may beobtained by substantially the same or equivalent means.

Having illustrated and explained typical embodiments of my invention,what I claim and desire to secure by United States Letters Patent is asfollows:

1. A magazine stapler of the type having a striking member for initiallyengaging the work, a hammer member movable relatively to the strikingmember for driving a staple into the work, a magazine for holding aplurality of staples, and a staple feed for-advancing staples from themagazine into the path of travel of the hammer member; characterized byan inertia member rigidly secured to the hammer member, a rack andpinion connection between the striking member and the inertia membercausing the inertia member and the hammer' member carried thereby tocontinue movement after movement of the striking member has been stoppedby engagement with the work, and means permitting relative movementbetween the inertia member and the rack and pinion connection after therack and pinion connection ceases to function.

2. A magazine stapler ot the type having a striking member for initiallyengaging the work, a hammer member movable relatively to the strikingmember for driving a staple into the work, a magazine for holding aplurality of staples, and a staple feed for advancing staples from themagazine into the path of travel of the hammer member; characterized byan inertia member rigidly secured to the hammer member, a rack andpinion connection between the striking member and the inertia membercausing the inertia member and the hammer member carried thereby tocontinue movement after movement of the striking member has been stoppedby engagement with the work, a stop for arresting the functioning of therack and pinion connection, and means permitting relative movementbetween the inertia member and the rack and pinion connection after vtherack and pinion connection ceases to function.

3. A stapler having a striking member for impact against the object tobe stapled, an inertia member actuated by the relative motion of thestapler to the striking member, a staple driver operated by the inertiamember, and means for feeding staples one by one to the staple driver,said stapler being characterized by means terminatng the relativeeffective movement between the stapler and the striking member at thetermination of the power travel of the stapler, and means carried bysaid inertia member to permit it to travel toward the work independentlyof the travel of the stapler and the striking member.

4. A stapler of the type having a movable striking member for impactagainst the object to be stapled, a rack 'integral with the strikingmember, an inertia member, a second rack slidably mounted in saidinertia member, means preventing relative motion between said secondrack and said inertia member, a pinion meshed with said racks, a stapledriver carried by said inertia member, means for feeding staples one byone to said staple driver, said stapler being characterized by means forstopping the effective relative movement between the stapler and thestriking member before the stapling stroke is completed, and saidrelative motion preventing means, said last mentioned means beingrendered inoperative when the travel oi?A the stapler is stopped at thework to permit the inertia member to complete the stapling stroke.

HENRY KEIL.

CERTIFICATE OF COHRECTI ON.

Patent-No; 2,5h5,267.

Maren 28, 19th.

HENRY KEIL.

It is hereby certified that error appears in the printed specificationof the above numbered patent requiring oorrecti. on as follows: Page 5,seccorrection therein that the same mw conform to the record of the inthe Patent Office.

'l line 6, for staples read stapler; line 58, before "stapler and thatthe said Letters Patent should be read with this Signed and sealed this61h day oi June, A. D. 19h14..

(Seal) Leslie Frazer )Acting Commissioner of Patents.

